           (conj c 4)
           a b c])))
 
+
+
+
+

  ; doseq is used for procedures returning nil
  (doseq [x (for [i (range 10)] (+ i 10))]
    (prn x))

  (let [a [1 2 3]
        b {:a 1 :b 2}


  ; null
  nil
  ; multimethods
  (defmulti encounter (fn [x y] [(:Species x) (:Species y)]))

